That’s according to this report in Hawaii Magazine:
Entrance fees at nearly 400 national parks, including Hawaii Volcanoes National Park located on Big Island, will waive entrance fees in recognition of National Public Lands Day on Sat., Sept. 29. The nationwide event is recognized as the largest single-day volunteer effort supporting public lands.
In addition to free admission, the Hawaii Volcanoes National Park will host two volunteer projects and a guided hike of a new trail in the Kahuku area. Here are some highlights.